Publications by authors named "John Sawicki"
A method for directly simulating coherent backscattering of polarized light by a turbid medium has been developed based on the Electric field Monte Carlo (EMC) method. Electric fields of light traveling in a pair of time-reversed paths are added coherently to simulate their interference. An efficient approach for computing the electric field of light traveling along a time-reversed path is derived and implemented based on the time-reversal symmetry of electromagnetic waves.
View Article and Find Full Text PDFBackground: Microinvasive squamous cell carcinoma of the vulva is defined as stromal invasion < or =1 mm and is treated by wide local resection. Whether criteria for microinvasive squamous cell carcinoma can be applied to Paget's disease of the vulva is unknown because of the rarity of that disease.
Cases: We initially evaluated three cases of microinvasive Paget's disease by using sentinel lymph node (SLN) analysis.
An unusual case of a sacral, extradural choroid plexus papilloma involving the S1-3 level is described. This 50-year-old woman presented with a 4-month history of pain involving her right buttock, perineum, and leg. Contrast-enhanced magnetic resonance (MR) imaging of the spine revealed a well-defined, mildly enhancing sacral canal mass at the S1-3 level; its appearance was consistent with that of a benign tumor.
View Article and Find Full Text PDFObjectives: Diagnostic accuracy of the ThinPrep process (Cytyc, Boxborough, MA) was compared with that of conventional (smear) cytopreparation for fine-needle aspiration (FNA) of head and neck masses.
Methods: In a prospective, randomized, single-blinded study, 209 patients served as their own controls and underwent 236 FNAs using ThinPrep and conventional (smear) cytopreparatory techniques.
Results: ThinPrep produced less air-drying artifact and less mechanical distortion than the conventional method.